<template>
  <div>
    <h1>{{id ? '编辑' : '新建'}}分类</h1>
    <el-form label-width="80px" @submit.native.prevent="save">
      <el-form-item label="上级分类">
        <el-select v-model="model.parent" placeholder="请选择">
          <el-option
            v-for="item in parents"
            :key="item._id"
            :label="item.name"
            :value="item._id">
          </el-option>
      </el-select>
      </el-form-item>
      <el-form-item label="名称">
        <el-input v-model="model.name"></el-input>
      </el-form-item>
      <el-form-item>
        <el-button type="primary" native-type="submit">提交</el-button>
      </el-form-item>
    </el-form>
  </div>
</template>

<script>

export default {
  props: {
    id: {}
  },
  data () {
    return {
      model: {},
      parents: []
    }
  },
  methods: {
    // 保存分类
    async save () {
      if (!this.model.name) return this.$message({ type: 'error', message: '请填写数据' })

      if (this.id) {
        // 如果传入了id就发送编辑分类名称的请求
        await this.$http.put(`rest/categories/${this.id}`, this.model)
      } else {
        // 没有id就是发送创建分类名称
        await this.$http.post('rest/categories', this.model)
      }
      this.$router.push('/categories/list')
      this.$message({
        type: 'success',
        message: '保存成功'
      })
    },
    // 编辑分类
    async fetch () {
      const res = await this.$http.get(`rest/categories/${this.id}`)
      this.model = res.data
    },
    // 上级分类
    async fetchParents () {
      const res = await this.$http('rest/categories')
      this.parents = res.data
    }
  },
  created () {
    this.fetchParents()
    this.id && this.fetch()
  }
}
</script>
